do i need an inline fan???

i ask this because, my room is 10x7x7. i have two uninsulated crawl spaces, and a room next to this room, probably with more air. what exactly is the inline fan used for.. to circulate air, and help reduce smell with a carbon filter.

also. what size inline fan would i need w/o a carbon filter and with? i was thinkin 449CFM. im not sure if thats to much or not.

bump^^^^^^^^^^^^^^

lol, -- ok inline fans are for channeling air -- they're the fans that you attach the flex tube to. i personally use them for my cool tube system -- some use for ac.

what are your temps?